Roasting furnace



Patented Mayyl v I v EDWARD1 J. rownniag DECEASED, "LATE 01rminwoon"CITY}eALIFeRN AfBY EDITH" v1 mlistrlim l Q AppIicati on me :r nuaryzeieza se ial'iioQzeaisifl This invention relates toiroasting furnaces,

V the in'ivention in one of its adaptatiens'being particularlyapplicable to furnacesfr-lab0- 'ratory useQf' w "Which will "bedependable, relatively simple' and efficient in Operation under 'variouscon-j features and advantages will clearly appear l 'clitions; and inwhich: the treatment of 0, .IlQus mat i l be Controlled. I 1 v a Variousfrom the detailed description given be l oiiv taken in eonn ection,With'the accompanying {a t-16 may be provide I drawings 1 which form apart of this specifie 'cation and illustrate merely, by wayfpf ex ample,one embodiment, ofth e invention; 3

The inventibn'c'onsists in such novel fea -e tures,"arrang'ements andcombinations as may e,

be shown anddescribed in connection with th e furnace'herein tliscldsedWay of ex- "jample only, and. as illustrative-of a preferred,

im th r "wi h certain-5 i novel rme-thods and steps ofprocessesas maybe'descri'bedherein." .l In the'dra inggFig. 1 is "a Vertical see- 1 cmp in 1 embodiment of the invention;

Fig. 2 is a Vertical seeti'onalviewpartly, broken away takensubstantially at right any gles to the section (if-Fig. 1 and, r I atopplan view of the same fur p l 4 l l V admittedatdesiredpdints 4111. theparticular "furnaee; shown'in the drawings; a single hearthmay-'beprovidecl as at l0 comprising a eircular plate ofme'tal, the"metalprefe'rably being" capable'o'f Withstand- Fig. is nace.

'ingunusually high temperatures Withoutde terioration' or warping, metalknow'nfin l the trade a as fPyrocast isfound to be: satis i factory forthis purp o'se Such a hearth plate fermly; r'abbled 'witheut' dangerfofeoiitamij The objects'ofthe inventien include the prqvision' of a'furnace of the class indicated further-and morels eifieebjetaf IThe'entirefurnacein p b supported infan elevated positiouupon a m st"iron' ftable; member 17 having sup- I sulating; Inateril- Offers ameans: vf

lating material as at -11. AL mixture-well,

raml'nedf in place has bee'n fOu'nd to be suit}, able for this purpose.An outer protective known inthe tradeias Celite? 'are'fully MARY FOWLER,EXECUTRIX, OF REDWOQDCITY,GALlEORNIAJlNDDUDLEfiZBAIRD} J J vOFBERKELEY,'rCALlFoltlillAyAsslGNORS110- NICHOLS 0022331 COMPANY, OE ewshellbf sheet'steel. may beprovided as ati 12.-

Thetop of the enclosure may-comprise a body I may behing'ecl as-atflfto' theshell member {of theheat insulating material asat 13f se-;pcured' ithi-n a coyer member, 14 which' nlturnq,

5 a "1 12. Such a hinge cover perinits the furnace; t0 beoonvenientlyopened forinspection and" l 1 m flL repa r O11 replacement of r'abbling:Ineehanisni and, heating devices as. C

theeever member. 1

willf be hereina-fterclescribecl. ;'Eye bdlts asf ter ffacilitatelifting "1 f shots/ n it.

portingilegs as at 1. 7 t irhearth ltlbeing se -j v 'curedltoj the tablememberlby sejrewsll) passe A ingfclownlfrom the-hearth through theingna'ce" outlet direct egntact with aboratory S pending suitable'rabv-vble'driving mechanismbeneaththe furnace infiv 5 I I vaiposition';facilitatin gi adjustmentsor bther necessary attentien'.Furthermore; the, ta-

ible'pr videsameans fdr supp ertingtlie rura 1 benches and} the like Iand alsop permits air 7 1 1pm f the'j. material underv treatment to: be

a ith e p s ashereinafter;described; At the middle ef the hearthasubstantial with the table member .17.". At its upper end e r-etherfluid mediurr11 exiting; in the furnace "1 1yvertically'extending'rotatable shaft may 'be,pr0 i d .ecl--asat 2Ocarried-inasingle bear- 1 ing21f0f extendedarea formed integrally, a

i ie's af i' aomy etfqrmediawith:a'z e i g;p5 P Qn 22, ei d na t ansversi f h sh t" forreceivingarabble supporting-member 23; fa-

whi ch' ina y. epmprise abu regtangularif a icres's seetion termed 10fnichrpme steel or a uothe'r suitabl'e naterial',;1itsi ends extendingsubstantially horizontally in" opposite direc ions o lrzer, the hearthcast iron \ger. other ubularlinembeiser sleeves -;as,.at,2et and-25;:

may'beislidably reeeived upon tlie en s-of;

f the bar 23 and each integrally formed with I a plurality of rabbleteeth as at 26 and 27 respectively. These tubular members, to-

gether'} with the rabble teeth, may be detacl ably secured on the bar23in a simple 7 mannerfby the use of pins as at 28 passing down throughaligned apertures in the bar and tubular members as shown. It'will be 3notedthat-the rabble teeth 26 and 27 respec- Ytive'lyare oppositelydirected. That is, with the shaft .20 rotating in a given direction,

the teeth 26', forexampl'e, will tend to deflect the material undertreatmenton the hearth 3 toward the center of the hearth, whereas at thesame time the rabble teeth 27 will tend to deflect such material towardthe periphery I of theliearth. Consequently, the material issubstantially uniformly rabble, first inwarda i ly'andthen outwardly ofthe hearth.

-Atoi1e side of the furnace a door as at may be provided, acorresponding openjin'gBO being formed in the insulating mate rial ofthefurnace wall. The material to be treated in the furnace may beintroduced either by opening the cover of the furnace or through thedoor 29 on to the hearth. A large brick, oroth er stopping means as attreatment is completed, the door 29 may be one of the rabble retainingpins 28 may be removed so as to permit remo'val ofthe tubular member:241 having rabble teeth which movetheore toward the center of thehearth.- 1 Then when the shaft is rotated, the rabble teeth 27 willgradually move thejmaterial outwardly -of"the jliearth and the materialI nace is-dischai'gechthe rabblemeinber 24 may of course be readilyrestored in place "andmay be discharged through an opening 32 atthe'periphery of the hearth. The opening' 32 may be normally-closed by aplug member 33, the plug member being normally held in'position withitsface'in the plane "f' of the-hearth surface by a controllever 34[engaging the-plugmember asat' 35 whereby, upon turningthe handleportion 36, theplug may be allowedto drop from the normal position asshown, permitting the ore to be dlschargedfas it is- .ra'kedtoward theopeningby" the rabble teeth 27 7 After the fursecured by itspin1member28.

"1,55" v an adjusting rod 38 :may extend permitting adjustment ofthe'height of'the The shaft 20 is preferably formed with a longitudinalcavity 37 as shown and through 1; rabbleteeth from apointoutside thefurf;:, nace. 'Th'e l-upper end of the rod 38 engages atjae therabble'supporting bar 23 and also may;be"-fslidably.received;within abearing portionat 40. "The lower end of the rod 38 may be slidablyreceived .within a bearing poition41 and the "vertical position oftheres pe'ct to the shaft 20 be adjusted by a screw 42 threaded throughthe lower end of the shaft 20. With this construction the height of therabble supporting bar 23, as well as the rabble teeth, in respect to thehearth and rotating shaft, may be accurately adjusted without openingthe furnace, merely by turning the screw 42. In order to limit theupward movement of the supporting bar 23 and to securely grip the same,removable shims 43 may; be inserted between the bar and the top portion44 of the shaft member 20.

Air ports may be provided as at 45 leading into the, cavity 37 and atthe upper end of the shaft the cavity 37 communicates with the spacewithin the furnace by way of passages 46 and the space 47 vbeneath thesupporting arin23. The amount of air admitted through these passages maybe adjusted by an air shutter member 48 encircling the shaft 20 at theports 45. Supplementing the air passages above described, furthcrpassages may be provided as at 49 outsidethe bearing 21 andcommunieating with the interior of the furnace through openings as at50. The passages 49 may be utilized not only to admit air but otherfluid mediums as may be desired to carry vonthe reactions within thefurnace.

The quantity of fluidadmitted at 49 may be adjusted as by a butterflyvalve 51 havinga set screw as at 52. The passages 37 and 49 permit acooling fluid to come into contact thus insuringa rapid and eflicienttreatment.

The furnace may be heated by a gas or oil torch or if desired,electrically. If a torch is to be used, the same may be admitted throughan opening as at. 53.

One form ofan'electricallyenergized heat,-

ing means is illustrated in Fig. 1 and may comprise an insulating plate54 having detachable supporting means as at 55 secured to'the covermember 14. lVithin the lower face of the insulating plate 54 a spirallyformed electrical resistance member 56 may be secured and provided withleading-in Wires as at57 and 58 passing through suitable insulators59within the cover -member. A detachable electrically energized heatingmeans is thus provided extending over the major portion of the heartharea and yet if desired, the same mav be readily'removed to permitfiring of the furnace by'a torch or other heating medium. The resistancemember 56 is preferably made of a relatively large cross-section'inorder that the same may be durable and-effect ve in operation. 1th aresistance member of such cross-section andof convenient length, it'isdesirable r V f 1,805,659

said rod, the upper end of Whichis adapted In testimony whereof We havesigned our to be engaged by and to support the rabble names to thisspecification.

V arm over said hearth, and apassage surround EDITH MARY' FUWLER,

Zing said rodwithih the shaft foriadmitting Ewecatm'm of the'lastwz'lland testament of ,7 gas into the furnace;

n 1' In a roasting furnace, a hearth therein, -a vertically extending'rotaryu rabble arm shaft having; a transversely extending seatjingportion for receiving and supporting a rabble arm located over saidhearth. a rod ex p V 7 tending'downwardly through the shaft from saidseating portion to the exteriorof the furnace, means: for adjustingthevv'ertical position of said rod, the'upperendof Whichis i adapted tobe'engaged by and to support the i 7 rabble arm, and means over saidseating pore a r tion for limiting'upvvard movement of the rabble arm. a7 r p a 7. Ina roasting furnace, a hearththerein, V a vertical rotaryrabble arm shaft, a bearing J r V at the under side of the furnace forcarrying I r theweight of said shaft, a rabble arm Within 1 1 it thefurnace carried by said shaft andv located 7 v over: said hearth, andmeans operable from 25 the under side of the furnace for adjusting 1.

1 the elevation of said rabble arm in respect to r r said shaft. V .7 a

8.111 a roasting furnace, a hearththerein,

garabble construction comprising a supporting Edward J. F owler,Deceased. 70 1 .DUDLEY BAIBD.

. armvlocated over saidhearth, a tubular memg a berslidably received onsaid arm and embrac- I ing the same,said tubular member being integrallyformed With a plurality of rabble teeth depending therefrom, andreleasable means 35 for securing said tubular member on the sup- 5porting arm against relative rotary and'lonlgitudinal movement. 1 r 9.1A furnacecomprising a hearth, a vertical'ly extending rotatable shaftat the middle a of saidhearth, armvmembers extending in f I vsubstantially opposite directions over the hearth from said shafttransversely thereof. tubular members slidably received on said i armsand embracmg the-same, said tubular y 45 members being integrally formedWith a plurality of rabble teeth depending therefrom, Q the teeth onamember at the one" side of-the shaft being directed at an angle te moveinateria'l'being treated on the hearth toward the 5o middle of thehearth,whilethe teeth on an opv r r posite arm memberare positioned atan angle to move material towardthe periphery of the vhearth, andreleasable means for securing saidgfirst named tubular member in respect55 to{the supporting "arm. I ,l V V v .1

10. .A'roasting furnace comprising a, hearth confined Within aninsulating enclosure,

electrically energized means forsubstantial- I flyuniformly heating saidhearth throughout 2 160 its-area, rabbling means operating over said 1 1i "hearth, said heating means comprising a: pl'atemember carryingelectrical resistance 'm'ean's and mounted over said rabbling'means,

aidpenclosureand saidiplate' 'being provided withcomniunicating flueopenings.

